1946
Schedule, Reg. 39 contd.
No. 18 of 1911.
ELECTRICITY SUPPLY.
(7) Where extra high pressure mains for three-phase supply consist of insulated conductors laid together, provision shall be made to ensure that neither the ground nor any neighbouring electric line or conductor can become charged by leakage from any such main.
Where this provision is made by a copper strip under a lead sheath, that strip shall be not less than sixteen-thousandths of an inch in thickness, and where it is made by steel wires outside a lead sheath, each of those wires shall be not less than one-tenth of an inch in diameter.
Where the mains are enclosed in a lead sheath, the sheath shall be not less than one-tenth of an inch in thickness, and shall be permanently and efficiently connected with earth.
(8) Extra high pressure mains for single phase supply and all cables connected therewith shall consist either of two concentric conductors or of separate conductors. Where concentric conductors are used, the insulation shall be maintained efficiently throughout except that the outer conductor shall be connected with earth at one point, and where separate conductors are used provision shall be made as in the case of mains for three-phase supply to ensure that neither the ground nor any neighbouring electric line or conductor can become charged by leakage.
(9) An extra high pressure electric line shall not be brought into use for the supply of energy before it has been completely laid, properly jointed, examined, and tested, or until it is in the sole charge of the company, and every such line shall during its use be in the sole charge of the company.
(10) Extra high pressure mains shall not pass through the same street box with other mains, unless they are enclosed in strong metal casing; and street boxes containing high pressure mains shall not contain pipes for water, gas, or other service, or electric mains belonging to another undertaking : Provided that any such street box may contain telephone wires belonging to the company.
(11) Sub-stations supplied at extra high pressure shall be established in suitable places and shall be in the sole occupation of the company.
(12) Sub-stations constructed below the surface of any street after the date of these regulations to which an extra high pressure is to be given shall not contain switches or other apparatus than transformers.
(13) The transforming apparatus at any sub-station supplied at extra high pressure shall be so arranged that there shall be no danger of any mains connected therewith being charged to any pressure beyond the limits of pressure for which those mains are intended.
(14) In delivering the energy to a sub-station at extra high pressure, the company shall exercise all due precautions so as to avoid risk of causing fire on the premises.
(15) All extra high pressure electric lines and apparatus placed in a sub-station shall be highly insulated and thoroughly protected against injury to the insulation or access of moisture, and any metal forming part of the electric circuit shall not, unless efficiently connected with earth, be exposed so that it can be inadvertently touched. All such lines shall be so fixed and protected as to prevent the possibility of electrical discharge to any adjacent metallic substance.
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1946
Schedule, Reg. 39 contd.]
No. 18 of 1911.
ELECTRICITY SUPPLY.
(7) Where extra high pressure mains for three-phase supply consist of insulated conductors laid together, provision shall be made to ensure that neither the ground nor any neighbouring or electric line or conductor can become charged by leakage from any such main.
Where this provision is made by a copper strip under a lead sheath, that strip shall be not less than sixteen-thousandths of an inch in thickness, and where it is made by steel wires outside a lead sheath, each of those wires shall be not less than one-tenth of an inch in diameter.
Where the mains are inclosed in a lead sheath, the sheath shall be not less than one-tenth of an inch in thickness, and shall be permanently and efficiently connected with earth.
(8) Extra high pressure mains for single phase supply and all cablos connected therewith shall consist either of two concentric conductors or of separate conductors. Where concentric conductors are used, the insulation shall be maintained efficiently throughout except that the outer conductor shall be connected with earth at one point, and where separate conductors are used provision shall be made as in the case of mains for three-phase supply to ensure that neither the ground nor any neighbouring electric line or conductor can become charged by leakage.
(9) An extra high pressure electric line shall not be brought into use for the supply of energy before it has been completely laid, properly jointed, examined, and tested, or until it is in the sole charge of the company, and overy such line shall during its use be in the sole charge of the company.
(10) Extra high pressure maius shall not pass through the same street box with other mains, unless they are inclosed in strong metal casing; and street boxes containing high pressure mains shall not contain pipes for water, gas, or other service, or electric mains belonging to another undertaking : Provided that any such street box may contain telephone wires belonging to the company.
(11) Sub-stations supplied at extra high pressure shall be established in suitable places and shall be in the sole occupation of the company,
(12) Sub-stations constructed below the surface of any street after the date of these regulations to which an extra high pressure is to be given shall not contain switches or other apparatus than transformers,
(13) The transforming apparatus at any sub-station supplied at extra high pressure shall be so arranged that there shall be no danger of any maius connected therewith being charged to any pressure beyond the limits of pressure for which those mains are intended.
(14) In delivering the energy to a sub-station at extra high pressure, the company shall exercise all due precautions so as to avoid risk of causing fire on the premises.
(15) All extra high pressure electric lines and apparatus placed in a sub-station shall be highly insulated and thoroughly protected against injury to the insulation or access of moisture, and any metal forming part of the electric circuit shall not, unless efficiently connected with earth, be exposed so that it can be inadvertently touched. All such lines shall be so fixed and protected as to prevent the possibility of electrical discharge to any adjacent metallic substance.
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